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goalsnr
At a time when it was unusual to do it, Dorothy Sterling wrote about such major figures of Black history as Harriet Tubman and W. E. B. Du Bois.

A. it was unusual to do it

B. it was unusual to do so

C. doing that was unusual

D. that was an unusual thing to be doing

E. it was not usual to do

Pls explain your answers.

Pronoun "it" refers to the noun that has not yet been mentioned A. it was unusual to do it

B. it was unusual to do so

Pronoun "that" refers to the noun that has not yet been mentioned C. doing that was unusual

Pronoun "that" refers to the noun that has not yet been mentioned. Plus awkward. D. that was an unusual thing to be doing

Unusual would be better than not usual. Plus, awkward construction E. it was not usual to do
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To do so is preferable, but is there any reason why C is wrong? Thanks.
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The preferred idiom here is ‘to do so’.
We can eliminate the other options based on this alone.

(A) it was unusual to do it
(B) it was unusual to do so
(C) doing that was unusual
(D) that was an unusual thing to be doing
(E) it was not usual to do - wrong intent

In Option C ‘that’ incorrectly refers to the action (wrote) that follows. It is not the right usage in formal/standard English, although we hear it a lot in colloquial speech.

Hope this helps!
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Hello from the GMAT Club VerbalBot!

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